EP0574216B1 - Digitaler Videobandrecorder - Google Patents

Digitaler Videobandrecorder Download PDF

Info

Publication number
EP0574216B1
EP0574216B1 EP93304409A EP93304409A EP0574216B1 EP 0574216 B1 EP0574216 B1 EP 0574216B1 EP 93304409 A EP93304409 A EP 93304409A EP 93304409 A EP93304409 A EP 93304409A EP 0574216 B1 EP0574216 B1 EP 0574216B1
Authority
EP
European Patent Office
Prior art keywords
output
data
mode
signal
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93304409A
Other languages
English (en)
French (fr)
Other versions
EP0574216A2 (de
EP0574216A3 (de
Inventor
Jong-Kyoung Yun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0574216A2 publication Critical patent/EP0574216A2/de
Publication of EP0574216A3 publication Critical patent/EP0574216A3/xx
Application granted granted Critical
Publication of EP0574216B1 publication Critical patent/EP0574216B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/926—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation
    • H04N5/9261—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation involving data reduction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
    • G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
    • G11B5/00847—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks
    • G11B5/0086—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes on transverse tracks using cyclically driven heads providing segmented tracks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/94—Signal drop-out compensation
    • H04N5/945—Signal drop-out compensation for signals recorded by pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • H04N9/8047—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction using transform coding
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4671—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling simultaneously the speed of the tape and the speed of the rotating head
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
    • H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
    • H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape

Definitions

  • the present invention relates to a digital video tape recorder. More particularly, the present invention relates to a digital video tape recorder which is capable of recording different amounts of video information on the same amount of tape.
  • VCR video cassette recorder
  • the amount of information which can be recorded onto the tape is limited, in part, by the speed at which the tape is transported through the video recorder. This has limited the usefulness of conventional video recorders. It has been proposed to extend the playing time of a video tape by reducing its speed by 1/N so that the effective recording time is increased by N times.
  • LP long play
  • SLP super long play
  • the tape speed is reduced to 1/3 of the normal.
  • the standard tape speed of a VHS VCR is 33.34 mm per second for NTSC colour television signals and 23.39 mm per second for PAL and SECAM signals.
  • Figure 1 illustrates the way in which video signals are recorded on a tape in the prior art.
  • the track interval A 1 V 1 T s x T f
  • Sin ⁇ V 1 .
  • the track T1 is proportional to the speed V 1 but is inversely proportional to the number of fields per second T s . Consequently, in a conventional analogue VCR the track width in LP mode is reduced by 1/2(T 2 - T 1 /2) compared with the track width T 1 of the standard mode, as only the tape speed is reduced, in the present example by 1/2 (V 2 -V 1 /2).
  • Figure 1C shows the recording track pattern formed on a tape of a digital video tape recorder.
  • the image signal data for one field is divided among two or more tracks. Accordingly, one frame of the image signal is divided among at least four tracks.
  • Figure 2 is a block diagram of a conventional digital video tape recorder.
  • a data compressing unit 1 compresses an incoming digital image signal.
  • the compression may be carried out by Discrete Cosine Transformation (DCT), the DCT coeficients being quantized and the resultant data further compressed using Huffman coding.
  • DCT Discrete Cosine Transformation
  • An error correction encoding unit 2 such as is disclosed in US-A-4 882 732, performs error correction encoding on the compressed image signal data.
  • a modulation unit 3 modulates the output of the error correction encoding unit 2.
  • the output of the modulation unit 3 is then amplified by a recording amplifier 4 and supplied to recording heads, mounted on a head drum 5, for recording on a tape.
  • the heads on the head drum 5 are also used to reproduce the image data recorded on the tape.
  • the reproduced image data signals are amplified by a reproducing amplifier 6.
  • a demodulating unit 7 then demodulates the output of the reproducing amplifier 6.
  • An error correction decoding unit 8 performs error correction decoding on the output of the demodulating unit 7.
  • a data expanding unit 9 expands the data output by the error correction decoding unit 8 into its original form.
  • JP-A-63-155877 addresses this problem by reducing the head drum speed and increasing the degree of video signal compression when the tape speed is reduced.
  • a digital video tape recorder selectively operable in a first mode or a second mode, comprising: a data compression means to compress a digital image signal by a first factor in said first mode and by a second factor, N times the first factor, in said second mode, N being a positive integer; a tape transport to drive a tape at a first tape speed in said first mode and at a second tape speed, 1/N times the first tape speed, in said second mode; a head drum to record a digital image signal, compressed by the data compression means, on a tape driven by the tape transport; a motor for driving the head drum, the head drum rotating at a first drum speed in said first mode and at a second speed, 1/N times the first drum speed, in said second mode; a microcomputer for producing a mode control signal; a frequency and phase signal generator mounted within the head drum for generating frequency generator signals and phase generator signals; a first amplifying and waveform shaping unit for receiving the frequency generator signals; a frequency divider for receiving
  • the data compression means comprises a first data compressor for compressing a digital video signal by said first factor, a second data compressor for compressing a digital video signal by said second factor and a switch for selectively passing the outputs of the data compressors, the first and second data compressors being arranged in parallel signal paths.
  • a recorder includes data expansion means for expanding compressed data reproduced by the head drum from a tape.
  • the data expansion means comprises a first data expander, a second data expander and switching means, wherein said switching means is operable to cause the first data expander to be effective in said first mode and the second data expander to be effective in said second mode.
  • a recorder includes reproduced signal processing means comprising a reproducing amplifier for amplifying a signal reproduced by heads in the head drum, a demodulating unit for demodulating the output from the reproducing amplifier, an error correction decoding unit for performing error-correction decoding of the output of the demodulating unit, and said switching means being configured for selectively applying the output of the error correction decoding unit to the first and second data expanders for expanding data compressed according to said first and second factors respectively.
  • a recorder includes an analogue-to-digital converter for converting an input analogue image signal into a digital signal and providing the digital signal to the compressing means.
  • a recorder includes an error correction encoding unit for error-correction encoding the output of the compressing means, a modulating unit for modulating the output of the error correction encoding unit, and a record amplifying unit for amplifying the output of the modulating unit so that the output can be recorded on a tape.
  • a recorder according to the present invention includes a digital-to-analogue converter for converting digital image signals output from the data expanders into analogue signals.
  • a data compressing means comprises an analogue-to-digital (A/D) converter 110 for converting an incoming image signal into a digital signal and first and second data compressing units 121, 122 for compressing the signal output by the A/D converter 110 by respective compression factors.
  • a recording signal processing means comprises a first control switch SW1 for selecting the output of either the first or the second data compressing unit 121, 122; an error correction encoding unit 130 for performing error correction encoding on the output selected by the first control switch SW1; a modulating unit 140 for modulating the output of the error correction encoding unit 130; and a record amplifying unit 150 for amplifying the output of the modulating unit 140 so that the output can be recorded on a recording medium.
  • a head is installed on the head drum 100 and records the output of the record amplifying unit 150 on the recording medium. The head is also used to reproduce the recorded signal.
  • a head control means comprises a motor 230 for driving the head drum 100; and a drum motor driving unit 220 for controlling the motor 230 in accordance with a mode control signal output by a microcomputer 210 to thereby vary the rotational speed of the head drum 100.
  • the drum motor driving unit 220 receives a frequency generator FG signal and a phase generator PG signal output respectively by a frequency generator and a phase generator mounted within the head drum 100.
  • a reproduced signal processing means comprises a reproducing amplifier 160 for amplifying the signal reproduced by the head; a demodulating unit 170 for demodulating the output of the reproducing amplifier 160; an error correction decoding unit 180 for performing error correction decoding on the output of the demodulating unit 170; and a second control switch SW2 for selectively applying the output of the error correction decoding unit 180 to one of two output terminals in accordance with a standard mode or a long play mode.
  • a data restoring means comprises first and second data restoring units 191, 192 for expanding the compressed data output from the reproduced signal processing means by different expansion factors in accordance with current mode; and a digital-to-analogue D/A coverter 200 for converting the digital image signal output by either the first or second data restoring unit 191, 192 into an analogue signal.
  • the analogue-to-digital A/D converter 110 converts the luminance and chrominance signals of an input image signal into a digital signal.
  • the image signal may be derived from, for example, a received broadcast signal, a camera or a television.
  • the first data compressing unit 121 is a compressing unit for standard mode operation and performs data compression with half the compression factor of the second data compressing unit 122.
  • DCT Discrete Cosine Transform
  • the DCT coefficients are compressed by Huffman coding to give a predetermined quantity of information for a predetermined plurality of DCT blocks.
  • the information rate of the first data compressing unit 121 is 20Mbps
  • the information rate of the second data compressing unit 122 is 10Mbps.
  • the second data compressing unit 122 has a compression factor of 2 times that of the first data compressing unit 121.
  • the microcomputer 210 produces a logic "1" as a mode control signal. If the mode control signal supplied to the first control switch SW1 is a logic "1", the switch SW1 selects the first data compressing unit 121. If the apparatus is in long play mode, the mode control signal is output by the microcomputer 210 as logic "0". The first control switch SW1 selects the second data compressing unit 122 in response to this signal.
  • the microcomputer 210 outputs the mode control signal in dependence on the operation of a key (not shown) by a user.
  • the error correction encoding unit 130 performs error correction encoding on the signals output by data compressing unit 121, 122 selected by the first control switch SW1.
  • the modulating unit 140 modulates the signal encoded by the error correction encoding unit 130.
  • the recording amplifying unit amplifies the output of the modulating unit 140, so that the output can be recorded on the recording medium.
  • the head is mounted on the head drum 100 for recording the signal amplified from the record amplifying unit 150 on the recording medium and for the reproduction thereof.
  • the reproducing amplifier 160 amplifies the image signal, reproduced from the recording medium by the head mounted on the head drum 100.
  • the demodulating unit 170 demodulates the signal, amplified by the reproducing amplifier 160.
  • the error correcting decoding unit 180 performs error correction decoding on the signal demodulated by the demodulating unit 170.
  • the second control switch SW2 applies the output of the error correction decoding unit 180 to the first data restoring unit 191 when the mode control signal output from the microcomputer 210 is at logic "1".
  • the mode control signal is at logic "0"
  • the output of the error correction decoding unit 180 is applied to the second data restoring unit 192.
  • the first and second data restoring units 191, 192 perform DCT decoding on the output of the error correction decoding unit 180 to recreate the original signal.
  • the expansion factor of the first data restoring unit 191 corresponds to the compression factor of the first data compressing unit 121 and is half that of the second data restoring unit 192. In other words, when the mode control signal is at logic "1", the first data compressing unit 121 and the first data restoring unit 191 are selected, and when it is at logic "0", the second data compressing unit 122 and second data restoring unit 192 are selected.
  • the D/A converter 200 converts the signals output by the first and second data restoring units 191, 192 into an analogue signal.
  • the mode control signal output by the microcomputer 210 is also supplied to the drum motor driving unit 220.
  • the drum motor driving unit 220 controls the speed of the motor 230 according to the mode control signal and varies the rotational speed of the head drum 100.
  • the speed of the head drum 100 during long play mode is half its speed during standard mode.
  • the drum driving unit 220 during long play mode, reduces the speed of the head drum by one half compared with the unit 220 during standard mode.
  • the FG and PG signals output by the frequency generator and the phase generator are amplified and waveform-shaped at first and second amplifying/waveform shaping units 221, 222.
  • a frequency divider 223 divides the frequency of the FG signal output by the first amplifying/waveform shaping unit 221 in response to the mode control signal output by the microcomputer 210. In other words, during extended mode, the frequency of the FG signal output by the first amplifying/waveform shaping unit 221 is divided by two.
  • a frequency discriminator 225 for counting a clock CLK comprises a counter 21, which is reset by the signal output by the first amplifying/waveform shaping unit 221, and a comparator 22 for comparing the count value of the counter 21 with a reference value. Accordingly, when an output of the first amplifying/waveform shaping unit 221 is applied to a reset terminal of the counter 21 in the frequency discriminator 225, the counter 21 is reset and counts until the next clock is received.
  • the comparator 22 compares the output of the counter 21 with a reference value (reference frequency).
  • the comparator 22 upon comparison, outputs a logic "1" when the current drum rotational frequency is higher than the reference value, and when the current drum rotational frequency is lower than the reference value, the comparator 22 outputs a logic "0".
  • the drum speed is 3600 rpm in the case of standard mode operation, and 1800 rpm in the case of long play mode operation.
  • a delay 224 delays for a predetermined period of time the output of the second amplifying/waveform shaping unit 142 in response to the mode control signal output by the microcomputer 210.
  • the PG signal output from the second amplifying/waveform shaping unit 142 is delayed twice as long during long play mode operation as in the standard mode operation.
  • a phase comparator 226 compares the phases of the PG signal and a preset reference signal.
  • the reference signal is based on the vertical synchronizing signal of the image signal during recording, and during the reproducing, it is based on either an external synchronizing signal or an internally generated signal.
  • An adder 227 adds the output of the frequency discriminator 225 to a phase difference signal of the phase comparator 226 and outputs the result to a proportional plus integral plus derivative (PID) control unit 228.
  • the PID unit 228 outputs a signal for controlling the speed and phase of the drum motor 230 to a current control unit 229 in accordance with the output of the adder 227.
  • the current control unit 229 controls the rotational speed of the drum motor 230 in response to the output of the PID unit 228.
  • VCR VCR of present invention Remarks Tape speed 1/2 1/2 Based on SP Drum speed 1 1/2 Based on SP Recorded information amount 1 1/2 Based on SP Track width 1/2 1 Based on SP Track number /field 1 1/2 Based on SP Merit
  • a long time of recording/reproducing is possible 1.
  • a long time recording and reproducing is possible.
  • a clear picture can be provided by 2 heads because of the same tape width.
  • a S/N ratio is reduced to 3dB in case of VHS because performances of the channels recorded on the tape are identical.
  • the tape travelling speed during long play mode is one half of the standard mode (SP mode) tape speed.
  • SP mode standard mode
  • a VCR according to the present invention reduces the tape travelling speed and the rotary speed of the head drum by one half and at the same time, compresses the data by twice as much to thereby reduce the recorded information amount by one half, so that extended recording and reproduction is possible. Accordingly, because the track width in the long play mode and in the standard mode is identical, crosstalk between the tracks does not occur. As illustrated in Table 1, the image signal of one field is recorded on half of one track.
  • the digital image signal recording/reproducing apparatus and the associated method in accordance with the present invention maintain the track spacing in the same way as in the standard mode when the digital image signal is recorded on the recording medium, so that crosstalk between tracks is prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Digital Magnetic Recording (AREA)

Claims (8)

  1. Digitaler Videobandrecorder, der wahlweise in einer ersten Betriebsart oder einer zweiten Betriebsart betreibbar ist, mit
    einer Datenkomprimierungseinrichtung (121, 122, SW1) zum Komprimieren eines digitalen Bildsignals in der ersten Betriebsart um einen ersten Faktor und in der zweiten Betriebsart um einen zweiten Faktor, der N mal der erste Faktor ist, wobei N eine positive ganze Zahl ist,
    einem Bandtransport zum Antrieb eines Bandes in der ersten Betriebsart mit einer ersten Bandgeschwindigkeit und in der zweiten Betriebsart mit einer zweiten Bandgeschwindigkeit, die 1/N mal die erste Bandgeschwindigkeit ist,
    einer Kopftrommel (100) zum Aufzeichnen eines durch die Datenkomprimierungseinrichtung (121, 122, SW1) komprimierten digitalen Bildsignals auf einem durch den Bandtransport angetriebenen Band,
    einem Motor (230) zum Antrieb der Kopftrommel (100),
    wobei die Kopftrommel (100) in der ersten Betriebsart mit einer ersten Trommeldrehzahl und in der zweiten Betriebsart mit einer zweiten Drehzahl, die N mal die erste Trommeldrehzahl ist, rotiert,
    einem Mikrocomputer (210) zur Erzeugung eines Betriebsart-Steuersignals,
    einem innerhalb der Kopftrommel (100) angebrachten Frequenz- und Phasensignalgenerator zur Erzeugung von Frequenzgeneratorsignalen (FG) und Phasengeneratorsignalen (PG),
    einer ersten Verstärkungs- und Signalformungseinheit (221) zum Empfang der Frequenzgeneratorsignale (FG),
    einen Frequenzteiler (223) zum Empfang des Ausgangssignals der ersten Verstärkungs- und Signalformungseinheit (221), wobei der Frequenzteiler (223) auf das Betriebsart-Steuersignal vom Mikrocomputer (210) reagiert, so daß während der zweiten Betriebsart die Frequenz des Ausgangssignals der ersten Verstärkungs- und Signalformungseinheit (221) durch N geteilt wird,
    einem Zähler (21), der dafür eingerichtet ist, Taktsignalimpulse (CLK) zu zählen und durch das Ausgangssignal des Frequenzteilers (223) rückgesetzt zu werden, einem Vergleicher (22) zum Vergleichen des Ausgangssignals des Zählers (21) mit einem Referenzwert,
    einer zweiten Verstärkungs- und Signalformungseinheit (222) zum Empfang der Phasengeneratorsignale (PG),
    einer Verzögerung (224) zum Verzögern des Ausgangssignals der zweiten Verstärkungs- und Signalformungseinheit (222) in Abhängigkeit von dem Betriebsart-Steuersignal vom Mikrocomputer, so daß während der zweiten Betriebsart das Ausgangssignal der zweiten Verstärkungs- und Signalformungseinheit (222) N mal so lange wie während der ersten Betriebsart verzögert wird,
    einem Phasenvergleicher (226) zum Vergleichen des Ausgangssignals der Verzögerung (224) mit einem Referenzsignal, um ein Phasendifferenzsignal zu erzeugen, einem Addierer (227) zum Addieren der Ausgangssignale des Vergleichers (22) und des Phasenvergleichers (226),
    einer Proportional-plus-lntegral-plus-Ableitung(PID)-Steuerschaltung (228) zum Empfang des Ausgangssignals des Addierers (227), und
    einer Motorstrom-Steuereinheit (229) zur Steuerung von Drehzahl und Phase des Kopftrommelmotors (230) in Übereinstimmung mit dem Ausgangssignal der Proportional-plus-lntegral-plus-Ableitung-Steuerschaltung (228).
  2. Recorder nach Anspruch 1, bei dem die Datenkomprimierungseinrichtung (121, 122, SW1) einen ersten Datenkomprimierer (121) zum Komprimieren eines digitalen Videosignals um den ersten Faktor, einen zweiten Datenkomprimierer (122) zum Komprimieren eines digitalen Videosignals um den zweiten Faktor und einen Umschalter (SW1) zum wahlweisen Durchlassen der Ausgangssignale der Datenkomprimierer enthält, wobei der erste und der zweite Datenkomprimierer (121, 122) in parallelen Signalwegen angeordnet sind.
  3. Recorder nach Anspruch 1 oder 2, mit einer Datenexpandierungseinrichtung (191, 192, SW2) zum Expandieren der durch die Kopftrommel (100) von einem Band wiedergegebenen komprimierten Daten.
  4. Recorder nach Anspruch 3, bei dem die Datenexpandierungseinrichtung (191, 192, SW2) einen ersten Datenexpandierer (191), einen zweiten Datenexpandierer (192) und eine Umschalteinrichtung (SW2) enthält, wobei die Umschalteinrichtung (SW2) betreibbar ist, den ersten Datenexpandierer (191) in der ersten Betriebsart arbeiten zu lassen und den zweiten Datenexpandierer (192) in der zweiten Betriebsart arbeiten zu lassen.
  5. Recorder nach einem der vorhergehenden Ansprüche, mit einem Analog-Digitalwandler (110) zum Umwandeln eines eingegebenen analogen Bildsignals in ein digitales Signal und zum Abgeben des digitalen Signals an die Komprimierungseinrichtung (121, 122, SW1).
  6. Recorder nach einem der vorhergehenden Ansprüche, mit einer Fehlerkorrektur-Codiereinheit (130) zum Fehlerkorrektur-Codieren des Ausgangssignals der Komprimierungseinrichtung (121, 122, SW1), einer Moduliereinheit (140) zum Modulieren des Ausgangssignals der Fehlerkorrektur-Codiereinheit und mit einer Aufzeichnungs-Verstärkungseinheit (150) zum Verstärken des Ausgangssignals der Moduliereinheit, so daß das Ausgangssignal auf einem Band aufgezeichnet werden kann.
  7. Recorder nach Anspruch 4, mit einer Wiedergabesignal-Verarbeitungseinrichtung, die einen Aufzeichnungsverstärker (160) zum Verstärken eines durch Köpfe in der Kopftrommel (100) wiedergegebenen Signals, eine Demoduliereinheit (170) zum Demodulieren des Ausgangssignals des Aufzeichnungsverstärkers (160) und eine Fehlerkorrektur-Decodiereinheit (180) zur Durchführung einer Fehlerkorrektur-Decodierung des Ausgangssignals der Demoduliereinheit (170) enthält, und wobei die Umschalteinrichtung (SW2) dafür eingerichtet ist, das Ausgangssignal der Fehlerkorrektur-Decodiereinheit wahlweise an den ersten und den zweiten Datenexpandierer (191, 192) anzulegen, um Daten, die in Übereinstimmung mit dem ersten bzw. dem zweiten Faktor komprimiert sind, zu expandieren.
  8. Recorder nach Anspruch 7, mit einem Digital-Analog-Wandler zum Umwandeln von digitalen Bildsignalen, die von den Datenexpandierern ausgegeben werden, in analoge Signale.
EP93304409A 1992-06-08 1993-06-07 Digitaler Videobandrecorder Expired - Lifetime EP0574216B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019920009911A KR0135872B1 (ko) 1992-06-08 1992-06-08 디지탈 영상기록재생장치 및 그 방법
KR991192 1992-06-08

Publications (3)

Publication Number Publication Date
EP0574216A2 EP0574216A2 (de) 1993-12-15
EP0574216A3 EP0574216A3 (de) 1994-03-30
EP0574216B1 true EP0574216B1 (de) 1998-11-18

Family

ID=19334357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304409A Expired - Lifetime EP0574216B1 (de) 1992-06-08 1993-06-07 Digitaler Videobandrecorder

Country Status (5)

Country Link
US (1) US5377050A (de)
EP (1) EP0574216B1 (de)
JP (1) JPH0690430A (de)
KR (1) KR0135872B1 (de)
DE (1) DE69322128T2 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002536A (en) 1990-07-06 1999-12-14 Hitachi Ltd. Digital transmission signal processing system and recording/reproducing system
US5530598A (en) * 1990-07-06 1996-06-25 Hitachi, Ltd. Digital transmission signal processing system and recording/reproducing system
US5337199A (en) * 1990-07-06 1994-08-09 Hitachi, Ltd. Digital transmission signal processing system and recording/reproducing system
EP0778703A3 (de) * 1992-03-24 1999-03-31 Kabushiki Kaisha Toshiba Vorrichtung zum Aufzeichnen/Wiedergeben von Kodes mit variablen Längen
US6091561A (en) * 1993-05-31 2000-07-18 Sanyo Electric Co., Ltd. Magnetic recording/reproduction apparatus which simultaneously scans two continuous tracks in both standard and long play modes
EP2385527A3 (de) * 1993-06-07 2012-12-19 Samsung Electronics Co., Ltd. Aufzeichnungs- Wiedergabegerät für digitale Information
GB2280566B (en) * 1993-07-30 1997-06-11 Sony Uk Ltd Video data compression
JP4290227B2 (ja) * 1994-01-07 2009-07-01 クウォンテル・リミテッド ビデオ処理装置、デジタルビデオデータを処理する方法、ビデオ処理システム、ビデオクリップを処理する方法、およびビデオクリップを処理するための装置
GB9400245D0 (en) * 1994-01-07 1994-03-02 Quantel Ltd A video processing apparatus and method
EP0767954B1 (de) * 1994-04-13 2002-09-18 RCA Thomson Licensing Corporation Magnetband mit nicht standardgemässem videosignal
JP3579926B2 (ja) * 1994-08-25 2004-10-20 ソニー株式会社 デジタルビデオ信号の再生方法及び再生装置
MY114287A (en) * 1994-12-26 2002-09-30 Sony Corp Digital video recorder
JPH08321136A (ja) * 1995-05-24 1996-12-03 Sony Corp デコーダ及び再生装置
KR100275043B1 (ko) * 1996-02-07 2000-12-15 구자홍 디지탈 브이씨알(d-vcr)의 영상 기록 재생장치
JP2000100081A (ja) * 1998-09-25 2000-04-07 Sony Corp デジタル信号の磁気記録装置及び方法、デジタル信号の磁気再生装置及び方法、並びに、テープ状記録媒体
KR20000041179A (ko) * 1998-12-18 2000-07-15 구자홍 자기기록매체의 장시간 녹화/재생방법
JP2001023318A (ja) * 1999-07-05 2001-01-26 Canon Inc 記録再生装置、記録装置及び再生装置
KR100636716B1 (ko) * 1999-08-05 2006-10-20 마쓰시타 덴키 산교 가부시끼 가이샤 자기 기록 재생 장치

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666938B2 (ja) * 1985-09-27 1994-08-24 株式会社東芝 ビデオテ−プレコ−ダの特殊再生装置
JPS63155877A (ja) * 1986-12-18 1988-06-29 Sony Corp デジタルｖｔｒ
JP2521967B2 (ja) * 1987-07-31 1996-08-07 キヤノン株式会社 ディジタル信号記録装置
JP2570377B2 (ja) * 1988-04-07 1997-01-08 ソニー株式会社 磁気記録および／または再生装置
JPH0792885B2 (ja) * 1988-05-16 1995-10-09 日本ビクター株式会社 磁気記録再生装置
JPH02206979A (ja) * 1989-02-07 1990-08-16 Sanyo Electric Co Ltd 長時間ビデオテープレコーダ
GB2233489B (en) * 1989-05-09 1993-03-31 Mitsubishi Electric Corp Digital video signal recording method and apparatus
US5191431A (en) * 1989-08-29 1993-03-02 Canon Kabushiki Kaisha Recording apparatus having plural operating modes involving diverse signal compression rates and different apportioning of pilot signal recording area
JPH03127355A (ja) * 1989-10-12 1991-05-30 Canon Inc 情報記録装置
JPH0388165A (ja) * 1989-08-31 1991-04-12 Canon Inc 磁気記録装置
JPH0384776A (ja) * 1989-08-29 1991-04-10 Canon Inc 磁気記録装置
JP3009189B2 (ja) * 1990-07-06 2000-02-14 株式会社日立製作所 ディジタル信号記録装置および記録再生装置
JP3026361B2 (ja) * 1990-11-30 2000-03-27 株式会社日立製作所 磁気記録装置

Also Published As

Publication number Publication date
KR940001125A (ko) 1994-01-10
KR0135872B1 (ko) 1998-05-15
EP0574216A2 (de) 1993-12-15
JPH0690430A (ja) 1994-03-29
US5377050A (en) 1994-12-27
DE69322128T2 (de) 1999-06-24
DE69322128D1 (de) 1998-12-24
EP0574216A3 (de) 1994-03-30

Similar Documents

Publication Publication Date Title
EP0574216B1 (de) Digitaler Videobandrecorder
EP0554086B1 (de) Vorrichtung zum Aufzeichnen von Videoinformation
JP2650472B2 (ja) ディジタル信号記録装置およびディジタル信号記録方法
US4963991A (en) Video tape recorder capable of recording both narrow band and wideband signals
US7688892B2 (en) High efficiency encoder and video information recording/reproducing apparatus
EP1211897B1 (de) Digitales Videobandgerät mit Nichtstandard Wiedergabegeschwindigkeit
US5191431A (en) Recording apparatus having plural operating modes involving diverse signal compression rates and different apportioning of pilot signal recording area
US5359428A (en) Digital video recorder operable in standard and long play modes
US6295406B1 (en) Digital signal recording apparatus for sampling and compressing signals according to various recording modes
US5499148A (en) Digital video tape reproducing apparatus compatible with tapes having a track width different from a rotary magnetic head width
JPH05260438A (ja) 可変速再生のためのディジタル磁気テープ記録再生方法
US5648855A (en) Method and apparatus for varying-speed reproduction of digital video signals
EP0574238B1 (de) Aufzeichnungs- und Wiedergabegerät für digitale Signale
EP0772366B1 (de) Digitales Aufzeichnungs-/Wiedergabegerät
JP3206481B2 (ja) ディジタル画像信号記録装置
JP3044918B2 (ja) ディジタル記録再生装置
JP3978897B2 (ja) 記録再生装置
CA2387418C (en) Digital vcr with non-standard speed playback
KR950005249B1 (ko) 디지탈 아날로그 겸용 기록 재생시스템
JPH04290083A (ja) ディジタル情報の磁気記録方法
JPH04172097A (ja) カラー映像信号の磁気記録再生方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19940914

17Q First examination report despatched

Effective date: 19961007

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69322128

Country of ref document: DE

Date of ref document: 19981224

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090603

Year of fee payment: 17

Ref country code: DE

Payment date: 20090604

Year of fee payment: 17

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20100826 AND 20100901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100607

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100607

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090611

Year of fee payment: 17